EP0030077A1 - Schiebefilter zum Aussondern von Verunreinigungen aus einem flüssigen Arbeitsmedium - Google Patents

Schiebefilter zum Aussondern von Verunreinigungen aus einem flüssigen Arbeitsmedium Download PDF

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Publication number
EP0030077A1
EP0030077A1 EP80303791A EP80303791A EP0030077A1 EP 0030077 A1 EP0030077 A1 EP 0030077A1 EP 80303791 A EP80303791 A EP 80303791A EP 80303791 A EP80303791 A EP 80303791A EP 0030077 A1 EP0030077 A1 EP 0030077A1
Authority
EP
European Patent Office
Prior art keywords
filter
filter plate
gap
sections
underlying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP80303791A
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English (en)
French (fr)
Other versions
EP0030077B1 (de
Inventor
James Peter Paquette
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Berlyn Corp
Original Assignee
Berlyn Corp
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Filing date
Publication date
Application filed by Berlyn Corp filed Critical Berlyn Corp
Publication of EP0030077A1 publication Critical patent/EP0030077A1/de
Application granted granted Critical
Publication of EP0030077B1 publication Critical patent/EP0030077B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/69—Filters or screens for the moulding material
    • B29C48/691—Arrangements for replacing filters, e.g. with two parallel filters for alternate use
    • B29C48/6912—Arrangements for replacing filters, e.g. with two parallel filters for alternate use the filters being fitted on a single rectilinearly reciprocating slide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion

Definitions

  • thermoplastic working materials e.g. polymers, and certain thermosetting resins, vulcanizable materials and polymerizable monomers
  • filter the working materials This may be done, for example, in a reclaiming process, to prepare re-claimed materials for use in a product; it may also be done, for example, in an extrusion apparatus, to make certain that no foreign matter will be introduced into an extrusion die.
  • An extrusion process is a continuous process in which the quality and quantity of the extrudate are proportional to the stability and consistency of the melt.
  • a change in operating conditions changes the quality or quantity or both of the end product, and some of the conditions which can change are affected by conventional filtering operations.
  • the practice of filtering the working material in an extrusion process requires the positioning of a filter medium across the path of material flow resulting in a pressure drop.
  • the size of the pressure drop is related to the difficulty with which working material passes through the filter medium.
  • the filter medium is clean the pressure drop across the medium is low as compared to the pressure drop which exists when the filter medium is clogged with collected contaminants. For example, a 1500 psi drop is typical for a clean filter, whereas a pressure drop of 4000 psi is typical for a clogged filter medium.
  • a rigid slide plate filter not unlike filters in use today, is shown in U.S. Patent No. 642,814-issued to Cowen in 1900. It has two filters on one slide plate, and when one of the filters becomes clogged the slide plate is moved to remove the first filter entirely and replace it with the second filter, bringing about an immediate dramatic change in' operating pressure.
  • Other forms of rigid slide plate filter like Cowen's are shown in Garrahan's U.S. Patent No. 1,195,576; Voi g ht U.S. Patent No. 3,684,419: Pa q uette U.S. Patent No. 3,797,655; Cooper et al U.S. Patent No. 3,804,758; and Heston U.S. Patent No. 3,983,038.
  • a rigid self-supporting filter plate carries filter media across the melt stream from an inlet port passageway to an outlet port passageway.
  • Typical practice in such filters is to use sections of filter plates in succession, one section following the other in a continuing progression across the path of the working material (i.e. the "melt stream").
  • the present invention relates to such slide plate filters in which each filter plate section carries on its upstream surface an individual section of filter screen or screens, and the sections of filter plate abut each other as they are progressed across the melt stream.
  • each filter plate section carries on its upstream surface an individual section of filter screen or screens, and the sections of filter plate abut each other as they are progressed across the melt stream.
  • the joint between them presents a possibility that some of the working material can leak, unfiltered, between them.
  • a gap of .002 to .007 inches exists between the plates.
  • any unfiltered working material which can squeeze through this gap does not present a problem; however, in some applications it may give rise to a result that is not desira ble.
  • the gap and any consequent leakage may be reduced by carefully machining the ends of adjacent plates, at the sacrifice of interchangeability and at significant extra cost.
  • each filter plate section is fitted with a retainer frame for the screen or screens carried by that section, and each retainer frame is off-set on its filter plate section so that it overlaps one end of the filter plate section and falls short of the other end.
  • the overlapping end of the frame on one filter plate section overlies the portion of the filter screen(s) on the abutting filter plate section which is not covered by the short-fall end of the frame on the abutting plate, so that the offset gap between adjacent frame ends overlies that portion of the filter screen or screens.
  • any working material that leaks into the gap between the filter plate sections must first have passed through a corresponding but offset gap between the retainer frames and a portion of the filter screen or screens carried by those sections.
  • the filter 10 that is shown in Figures 1 and 2 has a main body comprised essentially of a front body member 14 and a rear body member 15 defining a flow passage 18 through which melted plastic stock can flow in the direction indicated by the arrows 17.
  • a pair of rails 12 and 13 are held between the front and rear main body members 14 and 15, respectively, by bolts 31. These rails together with the body members define a transverse passage 11 through which the filter plates and filter media are moved across the flow passage in the direction indicated generally by the arrow 16 in Figure 1.
  • Heat exchangers 19 are fitted to the main body members 14 and 15 at both ends of the transverse passage 11 for use in forming seals of plastic stock at the inlet and outlet ends of the transverse passage 11.
  • Fins 20 are provided on the heat exchangers, if they are intended to exchange heat with the ambient air. Gaps 44 are provided between the heat exchangers thermally from the main body of the filter. Alternatively, mechanical seals may be used, as is taught in U.S. Patent No. 4,059,525.
  • the active filter mechanism comprises a series of filter plate sections 30, 31 abutted end to end in the transverse passage 11.
  • Each filter plate section carries a section of filter screen media 32, 33, respectively, on a surface facing the oncoming plastic stock flowing in the flow passage 18.
  • the filter screen sections are of the same dimensions as the plan view of the respective filter plates on which they are carried.
  • a retainer plate 34, 35 overlies each filter screen section, respectively, on each of the filter plate sections 30, 31.
  • the filter plates each have bores 38 through them separated by filter plate material 36, for supporting the filter screen media against the pressure of the oncoming plastic stock, while allowing the filtered plastic stock to pass through the filter plates.
  • the retainer plates have larger openings 34', 35', respectively, for giving ready access to the filter screen media. As is seen in Figure 6, the openings in the retainer plates are preferably square in plan so as to maximize the access provided to the filter screen media.
  • the gap 51 between confronting ends of two sequential filter plate sections 30, 31, is blocked by an end 37 of one of the retainer plates 34 which is off-set from its underlying filter plate section 30.
  • the next-following retainer plate 35 is off-set from its underlying filter plate section 31 so that its confronting end 39 forms with the adjoining end 37 of the next-preceding retainer plate 34 a second gap 53 which is off- set from the underlying gap 51 between the two filter plate sections 30, 31.
  • This second gap 53 also overlies a portion of the filter screen media 33 that is carried on a second filter plate section 31.
  • the invention provides that filter screen media will be present in the path through the gap between the filter plates, and no plastic stock can pass through the apparatus 10 without being filtered.
  • a representative filter plate section 30 is illustrated in Figures 3, 4 and 5.
  • a rigid body comprised of side rails 61, 63, and between them an operative filter- plate portion 65 which includes the bores 38 and intervening support members 36.
  • a notch 67, 68 is provided in each of the rails 61, 63, respectively, facing inwardly toward the operative filter plate portion 65.
  • a representative section of one notch 68 is shown in Figure 5. These notches are located a specific distance, for example, the dimension A, from one of the edges, in Figure 3 the right hand edge 69, for the purpose of locating the overlying retainer plate relative to both edges of the filter plate section.
  • the retainer plate 34 which overlies the first filter plate 30 is shown in plan in Figure 6, comprising essentially a frame 71 which outlines the plate and has cross members 72, 73 which define the square openings 34'. Each of the long sides of the frame is fitted with a key 77, 78, for interlocking with the notches 67, 68, respectively, on the filter plate rails 61, 63, respectively.
  • the keys are located a dimension, such as the dimension B as shown in Figure 6, from one of the ends 79 of the retainer plate such that when the keys are fitted into the notches the end 79 of the retainer plate will overlie the end 69 of the filter plate section in the manner shown in Figure 1.
  • each retainer plate is locked into an off-set position on its underlying filter plate section so that when the filter plate sections bearing retainer plates are fed end to end into the transverse passage 11, the gaps between filter plate sections will automatically become gaps which filter any plastic stock that escapes through them.
  • the rails 61, 63 extend above the surface of the operative portion 65 on which the filter screen is supported, so that when the retainer plate (34 on filter plate section 30, for example) is present the outer surface of the retainer plate may be substantially flush with the top surfaces of the rails.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Filtration Of Liquid (AREA)
EP80303791A 1979-11-28 1980-10-24 Schiebefilter zum Aussondern von Verunreinigungen aus einem flüssigen Arbeitsmedium Expired EP0030077B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US98061 1979-11-28
US06/098,061 US4268391A (en) 1979-11-28 1979-11-28 Leak proof filter plate system for slide plate filters

Publications (2)

Publication Number Publication Date
EP0030077A1 true EP0030077A1 (de) 1981-06-10
EP0030077B1 EP0030077B1 (de) 1984-02-01

Family

ID=22266708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80303791A Expired EP0030077B1 (de) 1979-11-28 1980-10-24 Schiebefilter zum Aussondern von Verunreinigungen aus einem flüssigen Arbeitsmedium

Country Status (5)

Country Link
US (1) US4268391A (de)
EP (1) EP0030077B1 (de)
JP (1) JPS5689807A (de)
CA (1) CA1158177A (de)
DE (1) DE3066421D1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3013038C2 (de) * 1980-04-03 1983-02-03 Werner & Pfleiderer, 7000 Stuttgart Siebwechselvorrichtung für Extruder
DE10116408C1 (de) * 2001-04-02 2002-11-21 Maag Pump Systems Textron Gmbh Vorrichtung zum Filtrieren einer Flüssigkeit, insbesondere zum Filtrieren einer polymeren Kunststoffschmelze
DE102004012617A1 (de) * 2004-03-12 2005-09-29 Maag Pump Systems Textron Gmbh Vorrichtung zum Filtrieren eines Fluids, insbesondere zum Filtrieren eines verflüssigten Kunststoffes
CN102164724B (zh) * 2008-09-26 2012-09-26 日立金属株式会社 陶瓷成形体的制造方法及其成形装置
US9090002B2 (en) * 2011-10-06 2015-07-28 Kolcor Technologies LLC Sealing device in a polymer filtration device
EP3308940A1 (de) * 2016-10-17 2018-04-18 Next Generation Analytics GmbH Filtersystem für viskose oder hochviskose flüssigkeiten, insbesondere kunststoffschmelzen und verfahren zur filtration von viskosen oder hochviskosen flüssigkeiten
US11260570B2 (en) * 2018-05-07 2022-03-01 PSI-Polymer Systems, Inc. Filtration apparatuses and screen changer devices for polymer processing and related methods

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3112525A (en) * 1961-09-20 1963-12-03 Monsanto Chemicals Apparatus for extruding thermoplastic material
US3684419A (en) * 1971-01-25 1972-08-15 Bradford R Voight Screen changer for extruders
US3804758A (en) * 1972-03-29 1974-04-16 Cosham Eng Design Ltd Screen changer
US3983038A (en) * 1975-11-03 1976-09-28 Heston Eugene E Self-purging screen changer and strainer plate
US4025434A (en) * 1975-10-06 1977-05-24 Bolton-Emerson, Inc. Screen changer with pre-fill screen blocks
US4059525A (en) * 1976-06-28 1977-11-22 Leonard L Slide filters
DE2729152A1 (de) * 1976-06-28 1978-01-05 Berlyn Corp Schiebefiltervorrichtung zur filterung eines unter druck stehenden fluidmaterials
DE2610816B2 (de) * 1975-04-17 1978-05-11 Mobil Oil Corp., New York, N.Y. (V.St.A.) Filter für einen Extruder
US4159953A (en) * 1978-06-05 1979-07-03 The Berlyn Corporation Slide plate filters for thermoplastic and similar materials

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3856277A (en) * 1973-09-28 1974-12-24 Gloucester Eng Co Inc Screen assembly for processing plastic
US4082487A (en) * 1977-03-28 1978-04-04 Western Electric Company, Inc. Apparatus for changing screen devices

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3112525A (en) * 1961-09-20 1963-12-03 Monsanto Chemicals Apparatus for extruding thermoplastic material
US3684419A (en) * 1971-01-25 1972-08-15 Bradford R Voight Screen changer for extruders
US3804758A (en) * 1972-03-29 1974-04-16 Cosham Eng Design Ltd Screen changer
DE2610816B2 (de) * 1975-04-17 1978-05-11 Mobil Oil Corp., New York, N.Y. (V.St.A.) Filter für einen Extruder
US4025434A (en) * 1975-10-06 1977-05-24 Bolton-Emerson, Inc. Screen changer with pre-fill screen blocks
US3983038A (en) * 1975-11-03 1976-09-28 Heston Eugene E Self-purging screen changer and strainer plate
US4059525A (en) * 1976-06-28 1977-11-22 Leonard L Slide filters
DE2729152A1 (de) * 1976-06-28 1978-01-05 Berlyn Corp Schiebefiltervorrichtung zur filterung eines unter druck stehenden fluidmaterials
US4159953A (en) * 1978-06-05 1979-07-03 The Berlyn Corporation Slide plate filters for thermoplastic and similar materials

Also Published As

Publication number Publication date
JPS5689807A (en) 1981-07-21
DE3066421D1 (en) 1984-03-08
EP0030077B1 (de) 1984-02-01
CA1158177A (en) 1983-12-06
US4268391A (en) 1981-05-19

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